tryptophan
英
['trɪptəfæn]
美
['trɪptəˌfæn]
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Noun:
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an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin
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用作名词 (n.)
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Once in the brain, the tryptophan is converted to serotonin.
一旦进入大脑，色氨酸会被转化成血清素。
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She rates dozens of foods for their levels of tryptophan.
她对数十种食物的色氨酸水平进行了估计。
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